Question

a fibrous sac which acts as a cushion to prevent friction in a joint, between a tendon and a bone: cartilage synovial fluid bursa

Explanation:

Cartilage is a connective - tissue that provides support and structure. Synovial fluid lubricates joints but is not a fibrous sac. A bursa is a fibrous sac that acts as a cushion to prevent friction between a tendon and a bone or in a joint.

Answer:

C. bursa